I got the below from a site (can't remember which one) and it's supposed to be a review of cassettes by Consumer Reports magazine. I don't know when these were done though. The SM-X was ommitted 'cause I suppose they were rating consumer and not pro tapes. What surprised me is that the TDK SA-X was rated better than the much praised Sony UX-Pro. Here are the results:
BRAND PRICE SCORE
TDK SA-X $3.75 87
FUJI DR-II $2.00 84
MAXELL XLIIS $3.25 83
SONY ES II $2.25 83
SONY UX TURBO $2.50 82
SONY UX-PRO $4.00 81
BASF CHROME $2.25 79
MAXELL XLII $2.75 79
FUJI FR-IIX $2.00 78
TDK SD $2.50 78
FUJI FR-IIXPRO $1.75 76
TDK SA $2.75 76
DENON HD6 $2.25 75
REALISTIC M-II $4.75 75
DENON S-PORT $2.25 74
REALISTIC HD $1.75 74
SONY ES II(100) $3.25 74
TDK SA (100) $2.75 74
3M BLACK WATCH $3.50 73
DENON HD8 $3.25 72
SONY CD it $2.00 72
SONY UX $2.75 71
DENON HD7 $3.00 69
MEMOREX HBS II $2.25 68